Further Nuclear Magnetic Resonance Studies of Flavone

The incorporation of 92.7% of 13 C at the carbonyl group of flavone allowed to measure two‐ and three‐bond carbon‐carbon coupling constants which range from 1.4 to 3.5 Hz, and to measure two‐, three‐ and four‐bond carbon‐hydrogen coupling constants which range from 0.3 to 3.8 Hz. A mixture of unlabe...

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Published in:Journal of spectroscopy (Hindawi) 1994-01, Vol.12 (2), p.85-89
Main Authors: García-Martínez, Cirilo, Morales-Rios, Martha S., Joseph-Nathan, Pedro
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Language:English
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container_issue 2
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container_title Journal of spectroscopy (Hindawi)
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creator García-Martínez, Cirilo
Morales-Rios, Martha S.
Joseph-Nathan, Pedro
description The incorporation of 92.7% of 13 C at the carbonyl group of flavone allowed to measure two‐ and three‐bond carbon‐carbon coupling constants which range from 1.4 to 3.5 Hz, and to measure two‐, three‐ and four‐bond carbon‐hydrogen coupling constants which range from 0.3 to 3.8 Hz. A mixture of unlabelled flavone 1 with its 4‐ 13 C labelled analogue 2 further allowed to measure one‐bond induced isotope shifts of ‐15.5 and ‐16.2 ppb for C‐3 and C‐4a, respectively, and a three bond induced isotope shift of +3.7 ppb for C‐I′.
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title Further Nuclear Magnetic Resonance Studies of Flavone
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